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Friday, 4 December 2015

QUESTION(Quadratic Equations) Solve the equation (x+7)^2=64

QUESTION(Quadratic Equations)
Solve the equation
(x+7)^2=64

SOLUTION: ===============
Starting with   (x+7)^2=64 
Take square roots of both sides to give 
x+7 =  \pm \sqrt{64}
x+7 =  \pm 8
x=  -7 \pm 8
x = -7-8  or -7 + 8
x = -15, 1

[  CHECK: 
when x=-15
LHS = (x+7)^2 = (-15 + 7)^2 = (-8)^2 = 64 = RHS.
when x = 1
LHS = (x+7)^2 = (1 + 7)^2 = (8)^2 = 64 = RHS.  ]

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