(2√5 + √3) x (2√5 - √3)
mohon dibantu dengan caranya ya
mohon dibantu dengan caranya ya
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= (2√5)(2√5) + (2√5)(-√3) + (√3)(2√5) + (√3)(-√3)
= (4x5) + (-2√(5x3)) + (2√(5x3)) + (-3)
= 20 - 2√15 + 2√15 - 3
= 20 - 3
= 17