Question

If y = 6x3 – 4x4 – 2x2 + 5x –9, find
at x=-1.​

Answer 1

Answer:

y=6(-1)^3-4(-1)^4-2(-1)^2+5(-1)-9

=-6-4-2-5-9

=-12-14

y=-26

Answer 2

Answer:

$\large{\underline{\boxed{\sf y = - 26}}}$

Step-by-step explanation:

Given that ;

y = 6x³ - 4x⁴ - 2x² + 5x - 9, we need to find the value of y at x = (-1).

⇒ y = 6x³ - 4x⁴ - 2x² + 5x - 9

⇒ y = 6 (-1)³ - 4(-1)⁴ - 2(-1)² + 5(-1) - 9

⇒ y = 6 (-1) - 4(1) - 2(1) - 5 - 9

⇒ y = - 6 - 4 - 2 - 5 - 9

⇒ y = - 26

Hence, the value of y is (-26).

$\rule{300}{2}$

$\large{\underline{\underline{\mathfrak{\heartsuit \: Extra \: Information: \: \heartsuit}}}}$

While solving this kind of question, we are mostly doing mistakes in calculations. So, here are some rules -

• (+) * (+) = (-)
• (-) * (-) = (+)
• (-) * (+) = (-)
• (+) * (-) = (-)