3. Check whether 7+3x is a factor of 3x3+7x. -Maths 9th

3. Check whether 7+3x is a factor of 3x3+7x. -Maths 9th
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Solution: 7+3x = 0 ⇒ 3x = −7 ⇒ x = -7/3 ∴Remainder: 3(-7/3)3+7(-7/3) = -(343/9)+(-49/3) = (-343-(49)3)/9 = (-343-147)/9 = -490/9 ≠ 0 ∴7+3x is not a factor of 3x3+7x
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