The internal length, breadth and height of a rectangular room are 6m, 5.2m, and 4.5m, respectively. It has two doors each 1.2m by 2m each and three windows
of 1m by 80cm.
a) Find the total internal area to be whitewashed. (excluding the doors and
windows)
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2

step-by-2step explanation:

the aswere is the one with all 8's and the second one is with the 10,8 and 6

step-by-step explanation:

your answer would be 12

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