(5+4z)²+(3+z)(3+5z) = 25+40z+16z²+9+15z+3z+5z²
= 21z²+58z+34
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(5+4z)²+(3+z)(3+5z) = 25+40z+16z²+9+15z+3z+5z²
= 21z²+58z+34