Question

what must be added to each of the following expression to make it a whole square..ist 4x²-12x+7 2nd 4x²-20x + 20​

Answer 1

Step-by-step explanation:

) 4x2 – 12x + 7 = (2x)2 – 2 (2x) (3) + 32 – 32 + 7 = (2x – 3)2 – 9 + 7 = (2x – 3)2 – 2 ∴ 2 must be added to the expression to make it a whole square. (ii) 4x2 – 20x + 20 = (2x)2 – 2 (2x) (5) + 52 – 52 + 20 = (2x – 5)2 – 25 + 20 = (2x – 5)2 – 5 ∴ 5 must be added to the expression to make it what-must-be-added-each-of-the-following-expression-to-make-it-a-whole-square-4x-2-12x-7