<span>4х(2х-4а)-6х(3х-2)=8x^2-16ax-18x^2+12x=-10x^2+12x-16ax
Если x=-8, то -10*(-8)^2+12*(-8)-16a(-8)=-640-96+128a=128a-736</span>
А)<span><span>(<span><span>x2</span>+x</span>)</span><span>(<span>49−<span>x2</span></span>)</span>=</span>Раскрытие скобок:<span><span>x2</span>49+<span>x4</span><span>(<span>−1</span>)</span>+x49+<span>x3</span><span>(<span>−1</span>)</span>=</span><span>49<span>x2</span>−<span>x4</span>+49x−<span>x3</span>=</span><span>−<span>x4</span>−<span>x3</span>+49<span>x2</span>+49x</span>Ответ: <span>−<span>x4</span>−<span>x3</span>+49<span>x2</span>+49x
В)</span><span><span>(<span><span>x2</span>−7</span>)</span><span>(<span><span>x2</span>+18</span>)</span>=</span>Раскрытие скобок:<span><span>x4</span>+<span>x2</span>18−7<span>x2</span>−126=</span><span><span>x4</span>+11<span>x2</span>−126</span>Ответ: <span><span>x4</span>+11<span>x2</span>−126
Д)</span><span><span>(<span><span>x2</span>−3<span>x2</span></span>)</span><span>(<span><span>x2</span>+7</span>)</span>=</span>Приведение подобных:<span><span>(<span>−2<span>x2</span></span>)</span><span>(<span><span>x2</span>+7</span>)</span>=</span>Раскрытие скобок:<span>−2<span>x4</span>−14<span>x2</span></span>Ответ: <span><span>−2<span>x4</span>−14<span>x2
</span></span></span>
1)(x-5)(x+5)
2)(6-4y)(6+4y)
3)(2x-9y)(2x+9y)
4)(0.3-11p)(0.3+11p)
5)(ab-4/3)(ab+4/3)
6)(a^4-x^5)(a^4+x^5)
7)(0.2b²-a^6)(0.2b²+a^6)
8)(1,3y^7-30z^4)(1.3y^7+30z^4)
9)-(1-36a^6b4)=-{(1-6a³b²)(1+6a³b²)}
10)49/25m^6n^4-25/16a²b^8=(7/5m³n²-5/4ab^4)(7/5m³n²+5/4ab^4)
№2
1)(4x-8)(4x+2)
2)(2x-8)(4x-2)
3)(a³-a-4)(a³+a+4)
4)2a(2b-2c)
#3
1)x²=49
x1,2=±7
2)25y²=4
y²=4/25
y1,2=±2/5
3)16x²=-25
x=пустое множество
4)(3x-5)²=16
3x-5=4 3x-5=-4
3x=9 3x=1
x1=3 x2=1/3
#4 хз
3)-да
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