Perkalian konstanta dengan variabel
1*x = x
2*x = 2x
123*x = 123x
Perkalian variabel dengan variabel
x*y = xy
x*y*z = xyz
x*x = x²
x*x*x = x³
x*y*x*y*x = x*x*x*y*y
= x³ y²
x² y*x y z³ = x²*x*y*y*z³
= x³ y² z³
Distributif pada perkalian
a(b + c) = ab + ac
(x + y)z = xz + yz
(a + b)(c + d) = a(c + d) + b(c + d)
= ac + ad + bc + bd
(2x + 3)(4x - 5) = 2x(4x - 5) + 3(4x - 5)
= 2x*4x + 2x*(-5) + 3*4x + 3*(-5)
= 8x² - 10x + 12x - 15
= 8x² + 2x -15
(7x - 8y)(9y + 10x) = 7x(9y + 10x) - 8y(9y + 10x)
= 63xy + 70x² - 72y² -80xy
= 70x² -17xy - 72y²
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