Question

the sum of roots of 2x^2+5x-7=0​

Answer 1

Answer:

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Step-by-step explanation:

One way to find the number of roots is by the graph. It is clear that the graph crosses the x-axis at 2 different values of x. Therefore there are 2 roots.

graph{2x^2+5x-7 [-20, 20, -12,12] [-20, 20, -12, 12]}

The give equation is

2x2+5x−7=0

By factoring method,

2x2+5x−7=0

(2x+7)(x−1)=0

by the zero property

2x+7=0 and x−1=0

it follows

the roots are

x=−72 and x=1