How do you FOIL (x + 3)(5x - 7)(x+3)(5x−7)?

1 Answer
Mark D.
May 1, 2018

5x^2+8x-215x2+8x−21

Explanation:

Multiply First => x xx 5x = 5x^2⇒x×5x=5x2
Multiply Outside => x xx -7 = -7x⇒x×−7=−7x
Multiply Inside => 3 xx 5x = 15x⇒3×5x=15x
Multiply Last => 3 xx -7 = -21⇒3×−7=−21

Now collect terms 5x^2-7x+15x-21=5x^2+8x-215x2−7x+15x−21=5x2+8x−21

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