The Minus Sign Didn't Cost You One Mark. It Cost You the Whole Question. Many students say, «"Ma'am, I knew the concept. I don't know how the answer became wrong."» And when...
Exponential Form = 100 = 102, where 2 is the power of 10. Laws of exponents: a-m = 1/ am a m * an = am*n am * an = am*n (am)n = am*n am / bm = (a/b)m a0= 1 (a / b)-m = (b/a)m (-1)odd = -1 (-1)even = 1 ( am / an ) = am-n