Question

Expand and simplify the following expressions : 1.(a-5)(a-7)

2.(x-2y)(3x+4)
3.(4x+3y)(4x-3y)
4.(6x-7y)(6x+7y)​

Answer 1

1. (a-5)(a-7)

a2 - 12a + 35

2. (x-2y)(3x+4)

3x2 +4x - 6xy - 8y

3. (4x+3y)(4x-3y)

16x2 - 9y2

4. (6x-7y)(6x+7y)

36x2 - 49y2

(the twos after the letters means squared)

:)