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