Question

For what values of x, the expression 15+4x-3x^{2}15+4x−3x2 is negative?



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Answer 1

Answer:

15+4x−3x

2

<0

⇒15+9x−5x−3x

2

<0

⇒3(5+3x)−x(5+3x)<0

⇒(5+3x)(3−x)<0

⇒(x−3)(3x+5)>0, multiply both sides by −1 , sign will change

⇒x∈(−∞,−

3

5

)∪(3,∞), use wavy curve method

Answer 2

Answer:please mark as champion Brainliest