What is the multiplicative inverse of 1/4

The multiplicative inverse is 4

The multiplicative inverse of a number is simply described as the reciprocal of a number

The multiplicative inverse of 1/4 can be calculated as

= 1/4 ÷ 1

= 4/1

= 4

Hence the multiplicative inverse of 1/4 is 4

Please see the link below for more information

link

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15