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4 years ago

Solve the equation 2x^2-7x=9

Mathematics

2 answers:

dalvyx [7]4 years ago

6 0

X=−1, 9/2 Decimal Form: -1, 4.5

pantera1 [17]4 years ago

5 0

Minus 9 from both sides
2x^2-7x-9=0
factor
(2x-9)(x+1)=0

set each to zero
2x-9=0
2x=9
x=9/2

x+1=0
x=-1

x=9/2 and -1

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4 years ago

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3 years ago

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2 years ago

Simplify completely quantity x squared plus 4 x minus 45 all over x squared plus 10 x plus 9 and find the restrictions on the va

dem82 [27]

(x² + 4x - 45)/(x² + 10x + 9)

Numerator = N = x² + 4x - 45 
= x² + 9x - 5x - 45
= (x² + 9x) - (5x + 45)
= x(x + 9) - 5(x + 9)
= (x + 9)(x - 5)

Denominator = D = x² + 10x + 9 
= x² + x + 9x + 9
= (x² + x) + (9x + 9)
= x(x + 1) + 9(x + 1)
= (x + 1)(x + 9)

Hence, the given expr. = N/D 
= {(x + 9)(x - 5)}/{(x + 1)(x + 9)
= (x - 5)/(x + 1)

Restrictions : x ≠ - 1, x = 5 

I hope my answer has come to your help. Thank you for posting your question here in Brainly.

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4 years ago

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