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OpenStudy (anonymous):
Find 87^2 using mental math
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OpenStudy (anonymous):
still need help on what
OpenStudy (anonymous):
87*87
OpenStudy (anonymous):
yeah
OpenStudy (p0sitr0n):
87 x 87 = (90 -3) x (90 -3) = 90 ^2 -2 x 90 x 30 + 9 = 8100 - 540 + 9 = 8100 - 531 = 7569
OpenStudy (anonymous):
=7569
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OpenStudy (kaptain_mittens):
p0sitr0n can you help me now por favor
OpenStudy (p0sitr0n):
yep yep
OpenStudy (anonymous):
thankyou so much everyone as you can tell I stink at algebra
OpenStudy (anonymous):
mental math can be hard
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