Question

-(p-q+r)² = .... Mohon bantuannya

Answer 1

= -(p-q+r)²
= -[ (p-q)² + 2(p-q)(r) + (r)² ]
= -[ (p² - 2pq + q²) + 2pq - 2qr + r² ]
= -p² + 2pq - q² - 2pq + 2qr - r²
= -p² - q² + 2qr - r²