Penjelasan dengan langkah-langkah:
1.
7x + 8x - 9y² ( 8x )
= 15x - 9y² × ( 8x )
= 15x - 9y² × 8x
= 15x - 72xy²
2.
7 + 10 × 2 - 100
= 7 + (10 × 2) - 100
= 7 + 20 - 100
= 27 - 100
= - 73
= 7x + 8x - (9 × 8) + (9 × x) + (y² × 8x) + (y² × x)
= 7x + 8x - 72 + 9x + 8xy² + xy²
= 15x - 72 + 9x + 9xy²
= 24x + 9xy² - 72
= 9xy² + 24x - 72
= -73
#Koreksi
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Penjelasan dengan langkah-langkah:
1.
7x + 8x - 9y² ( 8x )
= 15x - 9y² × ( 8x )
= 15x - 9y² × 8x
= 15x - 72xy²
2.
7 + 10 × 2 - 100
= 7 + (10 × 2) - 100
= 7 + 20 - 100
= 27 - 100
= - 73
7x + 8x - 9y² ( 8x )
= 7x + 8x - (9 × 8) + (9 × x) + (y² × 8x) + (y² × x)
= 7x + 8x - 72 + 9x + 8xy² + xy²
= 15x - 72 + 9x + 9xy²
= 24x + 9xy² - 72
= 9xy² + 24x - 72
7 + 10 × 2 - 100
= 7 + 20 - 100
= 27 - 100
= -73
#Koreksi