Question

25.expand the following
(X+1)(x+4)(x+6)




ANSWER THE FOLLOWING
6×3=18

27.Factorise x2+14x+49

28.find x (7x-5)-4(2+5x)=10(2-x)

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Answer 1

Answer:

1. (x+1)(x+4)

= x(x+4)+1(x+4)

= x^2+4x+x+4

=x^2+5x+4

2. (x^2+5x+4)(x+6)

= x^2(x+6)+5x(x+6)+4(x+6)

x^3+6x^2+5x^2+30x+4x+24

x^3+11x^2+34x+24

27. x2+14x+49

= X2+(7+7)x+49

=X2+7x+7x+49

= x(x+7)+7(x+7)

=(x+7)(x+7)

28.

L.H.S. R.H.S

(7x-5)-4(5x+2) = 10(2-x)

7x-5-20x-8=20-10x

-13x-13=20-10x

-13x+10x=20+13

-3x=33

x=-3.