Relation between Roots and Coefficients for Quadratic
Find the sum ...
Question
Find the sum of:
(iv) 9x2−6x+7,5−4xand6−3x2
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Solution
Step: Find the sum of given expressions (9x2−6x+7),(5−4x)and(6−3x2)
We need to find sum of (9x2−6x+7), (5−4𝑥) and (6−3x2)=(9x2−6x+7)+(5−4x)+(6−3x2) =(9x2−3x2)+(−6x−4x)+(7+5+6) [Groping like terms] =6x2−10x+18
Hence, the answer is 6x2−10x+18.