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FOIL. First, inner, outer, last. Multiply each term in the first by each term in the last and add them up.
(8 - 10x)(8 - 10x) = 64 - 80x - 80x + 100x² = 100x² - 160x + 64 ■ thank you, I love you, my maths teacher was gonna be pissed
9x squared-15x squared = -6
1 squared = 1 2 squared = 4 3 squared = 9 4 squared = 16 5 squared = 25 6 squared = 36 7 squared = 49 8 squared = 64 9 squared = 81 10 squared = 100
No
3x squared - (3x) squared = 0
13 squared x 4 squared is equal to 2,704.