Question

please bro or sis answer me please if you answer is irrelevant I will report your answer​

Answer 1

Answer:

1) (5x-4y)(5x+4y)

= (5x)^2 - (4y)^2     [(a+b)(a-b) = a^2- b^2]

= 25x^2 - 16y^2

2) (a+b+c)^2 = a^2 + b^2 + c^2 + 2ab + 2bc + 2ac

3) (2x + 3y + 4z)^2

 = (2x)^2 +(3y)^2 + (4z)^2 + 2(2x)(3y) + 2(3y)(4z) + 2(2x)(4z)

 = 4x^2 +9y^2 +16z^2 + 12xy + 24yz + 16xz

4) 9m^2 + 4n^2 +16p^2 + 12mn - 16np - 24mp (this question is same as                            previous)

5) (x+5)(x+6)(x+4) = (x^2+11x+30)(x+4)       [(x+a)(x+b) = x^2 + (a+b)x + ab]

                            = x^3 + 4x^2 + 11x^2 + 44x + 30x + 120

                            = x^3 + 15x^2 + 74x + 120

HOPE MY ANSWERS HELPED!!