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Show that (3x+7)² -84x = (3x-7)​
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3 votes
Show that (3x+7)² -84x = (3x-7)​

User GuilhermeFGL
by
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1 Answer

0 votes
First expand...

(3x+7)^2 = 9x^2+42x+49

Bring down -84x...

9x^2+42x+49-84x

Solve...

9x^2-42x+49

Factor...

(3x-7) (3x-7) = (3x-7)^2

User BlackCow
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