Simplify:

Question

[5(4-x) + (25-9)] + [63(5y + 15) – 4]

Answer 1

Remove brackets from outside in, and apply distributive laws as necessary:

[5(4-x) + (25-9)] + [63(5y + 15) – 4]
= 5(4-x) + (25-9) + 63(5y + 15) – 4
= 5*4-5x + 16 + 315y + 63*15 - 4
= 20 -5x + 16 + 315y + 945 -4
= 977 -5x + 315y