Question

Ajutati-ma va rog la exercitiile 4 si 5 din aceasta imagine .
Ofer coronita .

Answer 1

4) a) (3a+4)²=9a²+24a+16
b) (2a–5b)²=4a²–20ab+25b²
c) (7x–8y)(7x+8y)=49x²–64y²
d) (2a+7b)²=4a²+28ab+49b²
e) (4x+6y)(4x–6y)=16x²–36y²
f) (10x+7)²=100x+140x+49
g) (13x–4y)²=169x²–104xy+16y²
h) (5b–6c)²=25b²–60bc+36c²
i) (18a–5b)(18a+5b)=324a²–25b²
5) a) (x+3)²=x²+6x+9
b) (2x–1)²=4x²–4x+1
c) (3x–2)²=9x²–12x+4
d) (4x–3)²=16x²–24x+9
e) (5x–2)²=25x²–20x+4
f) (3x–4)²=9x²–24x+16
g) (2x+3)²=4x²+12x+9
h) (3x+5)²=9x²+30x+25
i) (5x–6)²=25x²–60x+36
j) (2x–5)²=4x²–20x+25
k) (3x+4y)²=9x²+24xy+16y²
l) (2x–7y)²=4x²–28xy+49y²
m) (3x–2y)²=9x²–12xy+4y²
n) (2a–5b)²=4a²–20ab+25b²
Formulele de calcul prescurtat:
(a+b)²=a²+2ab+b²
(a-b)²=a²–2ab+b²
(a+b)(a–b)=a²–b²