(2-10 √(1÷25+h))/(h√(1÷25+h))x(2+10√(1÷25+h))/(2+10√(1÷25+h)) need to know how the numerator equals -100h. I tried it but i couldn't see how it happens!
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Originally Posted by instantaneo (2-10 √(1÷25+h))/(h√(1÷25+h))x(2+10√(1÷25+h))/(2+10√(1÷25+h)) need to know how the numerator equals -100h. I tried it but i couldn't see how it happens! Spoiler: $\displaystyle (a-b)(a+b) = a^2-b^2$
thanks!
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