Question

7. Expand each of the following expressions.
(a) (a + 1)(a -9) (b) (6-2)(b +7)
(c) (c - 5)(C-6) (d) (3d + 1)(5-20)
(e) (1 - f)(7f+6) (f) (4- 3h)(10-9h)
plz urgently need answers​

Answer 1

Explanation:

a) (a+1)(a-9)

=a(a-9)1(a-9)

=a²-9a+a-9

=a²-8a-9

b) (6-2)(b+7)

=6(b-7)-2(b+7)

=6b-42-2b-14

=6b-2b-42-14

=4b-56

c)(c-5)(c-6)

=c(c-6)-5(c-6)

=c²-6c-5c+30

=c²-11c+30

d)(3d+1)(5-20)

=3d(5-20)+1(5-20)

=15d-60d+5-20

=-45-15

=-60

e)(1-f)(7f+6)

=1((7f+6)-f(7f+6)

=7f+6-7f²-6f

=7f-6f-7f²+6

=-13f-7f²+6

=-7f²-13f+6

f)(4-3h)(10-9h)

=4(10-9h)-3h(10-9h)

=40-36h-30h+27h²

=27h²-66h+40