Question

ᴍ ɪ ᴋ ᴜ ·͜·❤︎‬

合ってるか教えて欲しいです߹ ߹

次の式を展開しなさい。
(1)(x+7)(x-7)=ズ-49
(2) (a-4)(a + 4) = a²-(6
(4) (a-3)(a+3)= a² -9
(3)(x+8)(x-8)=72-64
(5)(x+4)(z-4)=ズ-16
(7) (a+6)(a−6) = a²-36
(9) (x+3)(x-3)= 2²-9
(10) (x+1)(x−1) = x²-|
(13) (a+4)(a−4) = α12-16
(15) (x−10)(x+10) = x²-(00
(17) (x+2)(x-2) = 20²-4
(19) (1+a)(1-a) = 1-a²
(21) (2+x)(2-x) = 4-x
2
(23) (6+a)(6-a) = 36-a²
(25) (7-x)(7+x) = 49-22
(27) (5+x)(5-x) = 25-22
(29) (+)-)²+
x+
x-
3
(6) (a+2)(a-2) = a²-4
(8) (x-9)(x+9) = x²-81
(10) (a-5)(a+5) = a²-25
(12) (a+8)(a−8) = a²-64
=2²-49
(14) (x-7)(x+7) =
(16) (a−6)(a+6) = α²-36
(18) (a+10)(a−10) = α² - (00
(20) (3+a)(3-a) = 9-a²
<20>
(22) (10-a)(10+a) = 100-a²
(24) (9−x)(9+x) = 81-2²
(26) (a+4)(4-a) = (4+a) (4-0)
=16-02
(28) (5-a)(a+5) = (5-a) (5+a)
2
(30)
a
-
I
25-02
a²
$

Answer 1

delta

あってますよ
(x+y)(x-y)=x²-y²
ですから