Question

Hitunglah

a. (x+5)²
b. (2x-6)²
c. (x+5)(x-7)
d. (2x+5)²

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Answer 1

Penjelasan dengan langkah-langkah:

a. (x+5)(x+5)

x²+5x+5x+25

x²+10x+25

b (2x-6)(2x-6)

4x²-12x-12x-36

4x²-24x-36

C. x²-7x+5x-35

x²-2x-35

d (2x+5)(2x+5)

4x²+10x+10x+25

4x²+20x+25

*maaf kalau salah*

Answer 2

Verified answer

[a]

(x + 5)² ------> gunakan rumus (a + b)² = a² + 2ab + b²

• a = x
• b = 5

(x + 5)²

= x² + 2(x)(5) + 5²

= x² + 10x + 25

[tex] \: [/tex]

[b]

(2x - 6)² -----> gunakan rumus (a - b)² = a² - 2ab + b²

• a = 2x
• b = 6

(2x - 6)²

= (2x)² - 2(2x)(6) + (-6)²

= 4x² - 24x + 36

[tex] \: [/tex]

[c]

(x + 5)(x - 7)

= (x)(x) + (x)(-7) + (5)(x) + (5)(-7)

= x² - 7x + 5x - 35

= x² + (-7 + 5)x -35

= x² - 2x - 35

[tex] \: [/tex]

[d]

(2x + 5)² ------> gunakan rumus (a + b)² = a² + 2ab + b²

• a = 2x
• b = 5

(2x + 5)²

= (2x)² + 2(2x)(5) + 5²

= 4x² + 20x +25