Question

Solve.
QIB
(1) Check whether x = -3 is a root of the quadratic equation
x2 + 4 = 13.
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Answer 1

Answer:

substitute the root of x in the equation in the L.H.S

L.H.S = X^2+4

=(-3)^2+4

=9+4

=13

=R.H.S

L.H.S =R.H.S

x= -3 is the root of the given equation

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Answer 2

Answer:

[tex]x {}^{2} + 4 = 13 \\ x {}^{2} = 13 - 4 \\ x {}^{2} = 9 \\ x = \sqrt{9 } \\ x=3