find the x in 3x2+2x-5/x2-7-8
Answers
Step-by-step explanation:
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Class 8
>>Maths
>>Algebraic Expressions and Identities
>>Operations on Algebraic Expressions
>>Add 5x^2 - 7x + 3, - 8x^2 + 2x - 5 and 7
Question
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Add 5x
2
−7x+3,−8x
2
+2x−5 and 7x
2
−x−2
Medium
Solution
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Correct option is B)
To simplify an algebraic expression that consists of both like and unlike terms, we need to move the like terms together and then add or subtract their coefficients.
Here, the terms are 5x
2
−7x+3,−8x
2
+2x−5 and 7x
2
−x−2. We add these terms as shown below:
(5x
2
−7x+3)+(−8x
2
+2x−5)+(7x
2
−x−2)
=(5x
2
−8x
2
+7x
2
)+(−7x+2x−x)+(3−5−2)
=x
2
(5−8+7)+x(−7+2−1)+(3−5−2)
=4x
2
−6x−4
Hence, (5x
2
−7x+3)+(−8x
2
+2x−5)+(7x
2
−x−2)=4x
2
−6x−4