Question

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Answer 1

Answer:

1. x2-3x-40

x2-8x+5x-40

x(x-8) +5(x-8)

(x+5)(x-8)

2. x2-11x-42

x2-14x+3x-42

x(x-14) +3(x-14)

(x-14) (x+3)

3. x2-4x-21

x2+3x -7x-21

x(x+3)-7(x+3)

(x-7) (x+3)

4. x2 +14x+48

x2+8x+6x+48

x(x+8)+6(x+8)

(x+6)(x+8)

5. x2+14x+45

x2+9x+5x+45

x(x+9)+5(x+9)

(x+5)(x+9)

6. 4x2+12xy+9y2

(2x)^2 +(2*2x*3y) +(3y)^2

(2x+3y)^2

(2x+3y) (2x+3y)

7. 36a2+36a+9

36a2+18a+18a+9

18a(2a+1)+9(2a+1)

(18+9)(2a+1)

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