Diketahui a x b = 15,a + b = 7,Nilai dari a kuadrat + b kuadrat a.8 b.9 c.19 d.79

a^2 + b^2= (a+b)^2 - ab
= (7)^2 - 15
= 49 - 15
= 34

Semoga mmbantu

[tex] {a}^{2} + {b}^{2} = {( a+ b)}^{2} - 2ab \\ = {( 7)}^{2} - 2 \times 15 = 49 - 30 = 19[/tex]