Question

If A = 3x square + 5x -3 and B= 5x square - 7 then 2A -B =

Answer 1

Answer:

Step-by-step explanation:

Given

A = 3x square + 5x -3 and B= 5x square - 7

Find

2A - B

Solution

=2(3x square + 5x -3 ) -(5x square - 7)

= 6x square + 10 x - 6 - 5x square - 7

= 6x square - 5x square + 10 x - 6  - 7

= x square + 10 x - 13

solve by quadratic euation

a = 1

b=  10

c=  -13

Formula

(-b+-√b^2-4ac) / 2a.

( -10+- √ 10^2 -4*1*-13) / 2(1)

( -10+- √100-52)/ 2

( -10+- √48)/ 2