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Question

Question 1 (iv)

Find the roots of the quadratic equations by using the quadratic formula in the following question.


x2+7x10=0

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Solution

Given equation is x2+7x10=0
on comparing with ax2 + bx + c = 0, we get
a = - 1, b = 7 and c = - 10
by quadratic formula, x=b±b24ac2a
=(7)±(7)24(1)(10)2(1)=7±49402
=7±91=7±32=42, 102=2, 5
So, 2 and 5 are two roots of the given equation.


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