Question

OTO
6 Find the value of m, if the value of the expression 2y3 – 5y2 + my-7 is equal to 10
when y=-1.​

Answer 1

Answer:

m = -24

Step-by-step explanation:

2y^3 - 5y^2 + my - 7 = 10

where

y = -1

m = ?

now

put value of y we get the expression

2y^3 - 5y^2 + my - 7 = 10

=> 2(-1)^3 - 5(-1)^2 + m(-1) - 7 = 10

=> -2 - 5 + (-m) - 7 = 10

=> -14 - m = 10

=> - m = 10 + 14

=> - m = 24

=> m = (-24) answer

Answer 2

Given :

• 2y³ - 5y² + my - 7 = 10
• y = - 1

To Find :

• Value of m

Solution :

Put value of y in given expression

$\implies \tt 2 {y}^{3} - 5 {y}^{2} + my - 7 = 10 \\ \\ \implies \tt2 {( - 1)}^{3} - 5 {( - 1)}^{2} + (- 1)m - 7 = 10 \\ \\ \implies \tt - 2 -5 - m - 7 = 10 \\ \\\implies \tt - 14 - m = 10 \\ \\\implies\tt - m = 10 + 14 \\ \\ \implies \tt - m = 24 \\ \\ \Large \boxed{ \tt \green{m = - 24}}$