Answer:
Step-by-step explanation:
12x + 6 - 8x + 7
= 12x - 8x + 6 + 7
= 4x + 13
Now multiplication with first part
4x + 1
(4x + 13) * (4x +1)
=4x * (4x +1) + 13 * (4x +1)
=16x^2 + 4x + 52x + 13
=16x^2 + 56x + 13
Now multiplication with second part
20x + 1
(4x + 13) * (20x + 1)
=4x * (20x + 1) + 13 * (20x + 1)
=80x^2 + 4x +260x + 13
=80^2 + 264x + 13
Now multiplication with third part
4x + 13
(4x + 13) * (4x + 13)
=4x * (4x + 13) + 13 * (4x + 13)
=16x^2 + 52x + 52X + 169
=16x^2 + 105x + 169
also equal to
(4x + 13)^2
Now multiplication with fourth part
20x + 13
(4x + 13) * (20x + 13)
=4x * (20x + 13) + 13 * (20x + 13)
=80x^2 + 52x + 260x + 169
=80x^2 + 312x + 169
