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Find the squares of the following numbers using the shortcut method. a) 125^2 b) 35^2 c) 85^2 d) 15^2please write the steps also |
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Answer» a)125^2=?we KNOW that(a +b)^2=a^2+2ab+b^2(100+25)^2=100^2+2*100*25+25^2=10000+5000+625=15625b)35^2=?35^2=(25 +10)^2=25^2+2*25*10+10^2=625+500+100=1225c)85^2=(100-15)^2=100^2+15^2-2*100*15=10000+225-3000=10225-3000=7225d)15^2=(10+5)^2=10^2+5^2+2*10*5=100+25+100=225hope it may HELP you |
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