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Find the roots of the following quadratic equations by factorisation:

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Learn Exercise 4.2

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(i) x² - 3x - 10 = 0 or x² - 5x + 2x - 10 = 0 or x (x - 5) + 2 (x - 5) = 0 or (x + 2) (x - 5) = 0 x = - 2 & x= + 5 (ii) √2x² + 7x + 5√2 = 0 or √2x² + 2x + 5x + 5√2 = 0 or √2x(x + √2) + 5(x + √2) = 0 or (√2x + 5) (x + √2)...
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(i) x² - 3x - 10 = 0 or x² - 5x + 2x - 10 = 0

or x (x - 5) + 2 (x - 5) = 0 

or (x + 2) (x - 5) = 0 x = - 2 & x= + 5

(ii) √2x² + 7x + 5√2 = 0

or √2x² + 2x + 5x + 5√2 = 0

or √2x(x + √2) + 5(x + √2) = 0

or (√2x + 5) (x + √2) = 0

x = -5/√2 & -√2

(iii) 2x² + x - 6 = 0 or 2x² + 4x - 3x - 6 = 0 

or 2x(x + 2) - 3(x + 2) = 0

or (2x - 3) (x + 2) = 0

x = 3/2 & -2

(iv) 2x² - x + 1/8 = 0 or 16x² - 8x + 1 = 0

or (4x - 1) (4x - 1) = 0

x = 1/4 & 1/4

(v) 100x² - 20x + 1 = 0

or (10x - 1) (10x - 1) = 0

x = 1/10 & 1/10

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CTET QUALIFIED Maths Problem Solver with 20 years experience

i) 5, -2 ii) , -5/sqrt2 iii)-2, 3/2 iv) 1/4, 1/4 v) imaginary roots
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Tutor

X_5 and x+2
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Maths Tutor

X^2--3r-10=0 (X-5)(x+2)=0 Then, x=5, -2
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Maths and Science Grade 8-10 SSC and CBSE tuitions

1)x=5,x=-2 2)x=-√2,x=-5/√2 3)x=3/2,x=-2 4)x=1/4,x=1/4 5)x=1/10,x=1/10
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mathematics and science professional tutor with 4 years of experience in home tuitions

Answer is +5 and -2
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mathematics and science professional tutor with 4 years of experience in home tuitions

Answer is -√2 and -5√2/2
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1) x2 - 3x -10=0 x2 -5x+2x-10=0 x(x-5)+2(x-5)=0 (x+2)(x-5)=0 x+2=0,x-5=0 x=-2,5
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1. X² -5x+2x-10=0 x(x-5) +2(x-5) =0 (X+2) (x-5) =0 X=-2, 5 2. √2x²+5x+2x+5√2=0 X(√2x+5) +√2(√2x+5) =0 (X+√2) (√2x+5) =0 X=-√2, -5/√2 3. 2x²+4x-3x-6=0 2x(x+2) -3(x+2) =0 (2x-3) (x+2) =0 X=3/2, -2 5. (10x)²-2.(10x)(1)+1²=0 (10x-1)²...
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1. X² -5x+2x-10=0

x(x-5) +2(x-5) =0

(X+2) (x-5) =0

X=-2, 5

2. √2x²+5x+2x+5√2=0

X(√2x+5) +√2(√2x+5) =0

(X+√2) (√2x+5) =0

X=-√2, -5/√2

 

3.  2x²+4x-3x-6=0

2x(x+2) -3(x+2) =0

(2x-3) (x+2) =0

X=3/2,  -2

 

5. (10x)²-2.(10x)(1)+1²=0

(10x-1)² =0

X=±1/10

 

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Tutor

1) -2 , 5 2) -√2 , -5/√2 3) -2 , 3/2 4) 1/4 5) 1/10
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