Question

what is the maximum value of 15+4x-3x^2
plz answer correctly and fast
waiting for ur answer

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

Answer 2

$15 +4x - {3x}^{2} \\ = 15 + x {}^{2}$

hope it's help you....