8p² + 5, 9p² - 7 Subtract the given equations.
Answers
According to the question we are asked to subtract the two expressions: (8p² + 5) and (9p² - 7)
So, we can simplify it as shown below:
(8p² + 5) - (9p² - 7)
or, 8p² + 5 - 9p² + 7
or, -p² + 12 [Ans]
Explanation:
We know that product of two negative terms is always positive i.e. when we ave removed the parenthesis, the sign of constant 7 changed from negative to positive.
Also have implemented that product of different sign always gives negative value. That is the reason 9 is negative.
Addition or subtraction of these expressions can be easily done but the fact one has to be aware of the sign used.
Given expressions are
8p² + 5 , 9p² - 7
i ) subtracting first expression
from second expression ,we get
9p² - 7 - ( 8p² + 5 )
= 9p² - 7 - 8p² - 5
= 9p² - 8p² - 7 - 5
= p² - 12
ii ) subtracting second expression
from first expression, we get
8p² + 5 - ( 9p² - 7 )
= 8p² + 5 - 9p² + 7
= 8p² - 9p² + 5 + 7
= -p² + 12
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