3. If one root of ar? + 2x +7 = 0 is (-2), then the value of a is:
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CORRECT QUESTION :–
If one root of ax² + 2x +7 = 0 is -2, then the value of a .
ANSWER :–
-(3/4)
EXPLANATION :–
GIVEN :–
-2 is a root of ax²+2x+7 = 0 .
TO FIND :–
VALUE OF "a" .
SOLUTION :–
➡️ IF -2 is a root of given quadratic equation , then it will satisfy the equation.
SO THAT –
➡️ a (-2)² + 2(-2) + 7 = 0
➡️ 4a - 4 + 7 = 0
➡️ 4a + 3 = 0
➡️ 4a = -3
↪ a = -(3/4) ✔✔✔
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