Question

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Answer 1

1a) x = 7 · 4,5 = 31,5

1b) x(x-6)=0 ⇒ x1 = 0 si x2 = 6

2a) (y+3)² = y² + 6y + 9

2b) x(x+1) - (x-1)² = x² + x -(x² -2x +1) = x² + x -x² +2x -1) =3x-1

3a) Piramida triunghiulara regulata are baza un triunghi echilateral si fetele laterale sun triunghiuri isoscele.

3b) Presupun ca se cere volumul.

V = Aria bazei × Inaltimea supra 3

V = (6²√3/4) × 8/3 = (36×8×√3)/3 = 12×8×√3=96√3 cm cubi