Question

5*x*y+5*x*z+21=?
x=4
y+z=100

Answer 1

5 · x · y + 5 · x · z + 21 = ?

x = 4

y + z = 100

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5 · x · y + 5 · x · z + 21 =   ( dam factor comun )

= 5 · x ( y + z ) + 21 =

= 5 · 4 · 100 + 21 =

= 20 · 100 + 21 =

= 2000 + 21 =

= 2021