Verified Answer :

I hope this helps you



x.3x+x.(-1)+5.3x+5.(-1)-(x^2-2.4.x+16)


3x^2-x+15x-5-x^2+8x-16


2x^2+22x-21

apologiabiology

basically, expand
expand them seperately to reduce confusion
exponent first
(x-4)^2=(x-4)(x-4)=x²-4x-4x+16=x²-8x+16

(x+5)(3x-1)=3x²+15x-x-5=3x²+14x-5

3x²+14x-5-(x²-8x+16)
3x²+14x-5-x²+8x-16
3x²-x²+14x+8x-5-16
2x²+22x-21

answer is
2x²+22x-21

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