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x + 5 - 2x = 9 -x = 4 x = -4
root(x+5)-root(x-5)=2 root(x+5)=2-root(x-5) x+5=4-4root(x-5)+x-5 4root(x-5)+6=0 root(x-5)=-3/2 x-5=9/4 x=9/4 +5 x=29/4
X2 - 4X - 5 = 0 easy factor, what two factors of - 5 add up to - 4 (X + 1)(X - 5) X = - 1 ------------- X = 5 --------------
2/x + 5
0.0000115 = 1.15 X 10 -5 ---------------------is this what you mean? Not - 4 but - 5 .